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Fiddler not getting traffic on a Windows service on newer OSs

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Daniel
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Daniel asked on 14 Feb 2019, 02:12 PM

 

I have a Windows service that is sending encrypted HTTP traffic.  I have set up Fiddler to decrypt  HTTPS traffic. I have logged in as the user whom this service is set to log in as. Though the service is creating traffic, I'm getting no traffic in Fiddler.

This seems to be happening on Windows 2016 servers. I have a Windows 2008 server on which the same service is running and I'm getting traffic just fine.  Does anyone know what might be the issue?

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Alexander
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answered on 25 Feb 2019, 12:51 PM
Hi,

Does Fiddler capture any traffic (browser, other applications, etc.)?

Regards,
Alexander
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Daniel
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answered on 25 Feb 2019, 01:55 PM
Yes it does. It will capture traffic from a browser if I have one running on it.
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Alexander
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answered on 01 Mar 2019, 12:29 PM
Hello,

It's possible that the service on the newer system is using WinHTTP instead of WinINET (this is what Fiddler is attached as proxy by default). You can find instructions how to set the WinHTTP proxy settings in this forum reply. Does this fix it?

Regards,
Alexander
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Daniel
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answered on 01 Mar 2019, 08:31 PM
I performed the command as mentioned but still get no traffic from the service. 
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Daniel
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answered on 01 Mar 2019, 08:53 PM

I performed the steps mentioned here and now I get my traffic. Thanks!

 

https://www.telerik.com/blogs/capturing-traffic-from-.net-services-with-fiddler

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Daniel
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answered on 01 Mar 2019, 08:54 PM

I performed the steps here https://www.telerik.com/blogs/capturing-traffic-from-.net-services-with-fiddler

and now I get my traffic.

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Daniel
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